What are some alternatives?
Pure Data - Pd (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical...
ChucK - A strongly-timed, concurrent, and on-the-fly audio programming language
VCV Rack - A cross-platform modular synthesizer.
Wavepot - Wavepot is addictive music or beats maker platform that offers a live-coding environment for creating sound and music.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
Klangmeister - Klangmeister is an open-source, live coding environment for composing music in your browser.